Sheavy

For pure early-Sabbath-style heaviness, one cannot get much closer
than Sheavy -- vocalist Steve Hennessey sounds remarkably similar
to Ozzy in his prime and the music style is a match as well.
Blue Sky Mind is more straightforward Sabbath, while
the succeeding albums mix in a bit of a psychedelic influence,
giving them a slight stoner rock vibe (similar to bands such as
Orange Goblin).
A recommended band in the doom world.